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MORTGAGE BANKING OPERATIONS - SF MSR Roll Forward (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Additions and amortization:
Amortization	$ 19,669	$ 17,754	$ 20,670
Net additions and amortization	4,239	1,670	(168,826)
Changes in fair value assumptions	(7,379)	19,955	16,224
Ending balance	61,584
Single family
Servicing Asset at Amortized Value, Balance [Roll Forward]
Beginning balance	49,966	68,109	252,168
Additions and amortization:
Originations	23,908	19,424	28,788
Sale	0	0	(176,944)
Amortization	(19,669)	(17,754)	(20,670)
Changes in fair value assumptions	7,379	(19,813)	(15,233)
Ending balance	$ 61,584	$ 49,966	$ 68,109

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- Definition

Changes in the fair value of mortgage servicing rights due to modeled amortization.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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- Definition

The value of new servicing assets, subsequently measured at fair value, acquired or created during the current period through purchases or from transfers of financial assets.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 860
-SubTopic 50
-Section 50
-Paragraph 3
-Subparagraph (a)(2)
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Fair value of an asset representing net future revenue from contractually specified servicing fees, late charges, and other ancillary revenues, in excess of future costs related to servicing arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Decrease in servicing assets subsequently measured at fair value resulting from conveyance of servicing rights to unrelated parties.

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Amount of increase (decrease) from changes in fair value classified as other for a contract to service financial assets under which the benefits of servicing are expected to more than adequately compensate the servicer.

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